SORD and sensory peripheral neuropathy: We recently identified biallelic mutations in the SORD gene, encoding sorbitol dehydrogenase, as a cause of hereditary motor neuropathy and hereditary motor and sensory neuropathy, here referred to as CMT-SORD.1 Based on the allele frequency of the most common c.757delG (p.Ala253GlnfsTer27) mutation (∼0.3% of all chromosomes) across many populations according to GnomAD, we calculated a prevalence of at least 3000 CMT-SORD cases in the USA alone, making CMT-SORD as the likely most common recessive form of CMT.